Respuesta :
When the net force on a car is zero in both the horizontal and vertical directions, the two situations that are true about the motion of the car are
(i) The car has stopped that vehicle has stopped. The weight of the automobile (downward) and the natural reaction of the asphalt to the car are the only two forces acting on it in this situation, both in a vertical direction (upward). The net force is zero because the two forces have the same magnitude but are acting in opposing directions.
(ii) The vehicle is moving at a consistent speed. There are four forces at play here: the car's weight (downward) and the typical impact of the asphalt on the vehicle in the vertical direction, as before (upward). The net force in the vertical direction is 0 because the two forces are equal in magnitude but act in different directions. Since the car is moving this time around as well, two forces are working in a horizontal direction: the driving force, which propels the vehicle ahead, and the frictional force, which moves the vehicle backwards. The amount of these two forces is identical because the car is driving at a constant speed, its acceleration is zero, and hence, there is no net force.
The net force is defined as the sum total of all the forces acting on the body while it is in motion or stationary state
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